Entrance skin exposure in PA chest radiography.
To determine whether entrance skin exposure during chest radiography is related to the thickness of the patient's chest, the authors used a dose-area product meter to record ESE during posteroanterior chest examinations of adult male patients. Manual adjustment of collimation and automatic exposure control were used. Analysis of the results showed a weak correlation between radiation exposure and chest thickness. The equivalent chest thicknesses of anthropomorphic phantoms are thinner than the chest thicknesses of most adult patients. Therefore, if it is necessary to measure the entrance skin exposure to a patient, it should be measured directly or computed from the actual technique used. An examination of the distribution of recorded dose-area product shows that this parameter can be a quality control criterion for limiting the field size in manual collimation.
Chu
R Y
RY
Department of Radiologic Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, USA.
Parry
C
C
Eaton
B G
BG
D000328:Adult; D004307:Dose-Response Relationship, Radiation; D006801:Humans; D008297:Male; D008433:Mathematics; D019047:Phantoms, Imaging; D013902:Radiography, Thoracic; D015203:Reproducibility of Results; D012867:Skin / Q000528:radiation effects*